EA4503YH

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The EA4503YH is an example of an off-line SMPS, or switch-mode power supply, that is used to convert AC mains into a DC output voltage. The EA4503YH is typically used in applications such as mobile phone chargers, DC lighting, and telecommunications equipment. This evaluation board is equipped with a 5V/6A step-down DC/DC converter, making it suitable for medium power applications.

The EA4503YH has a wide input voltage range of 85-305VAC, allowing it to operate in different power input environments. It also has an over-current protection circuit, over-voltage protection circuit, and a temperature protection circuit to ensure its stable operation. Additionally, this evaluation board comes with a convenient USB port which supports UART control, making it an ideal solution for communication applications.

The working principle of the EA4503YH is based on a switching concept. Firstly, the primary side AC input is rectified and filtered. This provides the DC input to the SMPS. The output voltage is determined by a feedback loop, which is created by a secondary winding on the transformer. This winding is separated from the primary winding, forming an isolation stage. The SMPS then uses a pair of switching transistors (MOSFETs) to create a high frequency alternating voltage on the primary winding. This voltage is applied to the transformer, which transfers power to the secondary winding. The secondary voltage is then rectified and filtered, producing the DC output voltage.

The EA4503YH is a feature-rich off-line SMPS, offering a wide range of features for a variety of applications. Its wide input voltage range and built-in protection circuitry provides reliable operation in harsh environment. Additionally, it is also equipped with a convenient USB port for communication and control. All these features make the EA4503YH an ideal choice for DC lighting, mobile phone chargers, as well as telecommunications applications.

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